A display device includes: a display panel including a pixel electrically connected to each of a data line, a first power line, a second power line, and a third power line; a power supply to provide a first power voltage to the first power line, and a second power voltage to the second power line; and a driver to provide a data voltage to the data line, and a third power voltage to the third power line. The driver is to determine whether a sensing voltage measured at the second power line is out of a reference range, and to limit the supply of the third power voltage when the sensing voltage is out of the reference range.
Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A display device comprising: a display panel comprising a pixel electrically connected to each of a data line, a first power line, a second power line, and a third power line; a power supply configured to provide a first power voltage to the first power line, and a second power voltage to the second power line; and a driver configured to provide a data voltage to the data line, and a third power voltage to the third power line, wherein the driver is configured to determine whether a sensing voltage measured at the second power line is out of a reference range, and to limit the supply of the third power voltage when the sensing voltage is out of the reference range.
A display device includes a display panel with pixels, each connected to a data line, a first power line, a second power line, and a third power line. The device also includes a power supply and a driver. The power supply provides a first power voltage to the first power line and a second power voltage to the second power line. The driver provides a data voltage to the data line and a third power voltage to the third power line. The driver monitors a sensing voltage measured at the second power line and compares it to a reference range. If the sensing voltage falls outside this range, the driver limits the supply of the third power voltage to prevent potential damage or malfunction. This mechanism helps maintain stable operation by dynamically adjusting power distribution in response to detected voltage deviations. The system ensures reliable performance by preventing excessive current or voltage fluctuations that could degrade display quality or damage components. The driver's ability to sense and respond to voltage irregularities enhances the device's robustness, particularly in applications where power supply variations or environmental factors could affect performance.
2. The display device of claim 1 , wherein the pixel comprises: a light emitting element connected between the first power line and the second power line; a driving current generating circuit configured to provide a driving current from the first power line to the light emitting element in response to the data voltage; and an initialization transistor connected between the third power line and one electrode of the light emitting element.
This invention relates to a display device, specifically an organic light-emitting diode (OLED) display, addressing the challenge of achieving uniform brightness and improved efficiency in pixel circuits. The display device includes an array of pixels, each containing a light-emitting element, such as an OLED, connected between a first power line and a second power line. A driving current generating circuit within each pixel supplies a driving current to the light-emitting element based on a data voltage, ensuring precise control over brightness. Additionally, an initialization transistor is connected between a third power line and one electrode of the light-emitting element. This transistor initializes the voltage at the electrode before emission, reducing threshold voltage variations and improving uniformity across the display. The third power line provides a reference voltage for initialization, ensuring consistent performance. The driving current generating circuit may include transistors and capacitors to stabilize the driving current, while the initialization transistor operates in response to a control signal, typically during a reset phase. This design enhances display uniformity, efficiency, and lifespan by mitigating degradation effects in the light-emitting elements.
3. The display device of claim 2 , wherein the driver is configured to measure the sensing voltage through a routing line branching off from the second power line.
A display device includes a display panel with a plurality of pixels, each pixel having a light-emitting element and a driving transistor. The device also includes a first power line and a second power line connected to the driving transistor, where the second power line supplies a variable voltage to control the light-emitting element. A driver circuit is connected to the first and second power lines and is configured to measure a sensing voltage through a routing line that branches off from the second power line. This sensing voltage is used to detect characteristics of the driving transistor, such as threshold voltage or mobility, which can vary over time due to degradation. By measuring these characteristics, the driver circuit can adjust the driving conditions to compensate for variations, ensuring consistent display performance. The routing line allows the sensing voltage to be measured without disrupting the normal operation of the display panel, providing real-time feedback for accurate compensation. This approach improves the reliability and longevity of the display device by dynamically adjusting for transistor degradation.
4. The display device of claim 2 , further comprising a switch connected between the third power line of the display panel and the driver, wherein the driver is configured to generate a control signal for turning off the switch when the sensing voltage is out of the reference range.
This invention relates to display devices, specifically addressing issues with voltage sensing and protection in display panels. The device includes a display panel with multiple power lines, a driver circuit, and a voltage sensing circuit. The voltage sensing circuit monitors a sensing voltage on a third power line of the display panel and compares it to a reference range. If the sensing voltage falls outside this range, the driver generates a control signal to activate a switch connected between the third power line and the driver. This switch, when turned off, disconnects the third power line from the driver, preventing potential damage or malfunction due to voltage irregularities. The driver may also include a voltage regulator to stabilize the power supply to the display panel. The system ensures reliable operation by dynamically responding to voltage fluctuations, protecting the display panel from overvoltage or undervoltage conditions. This approach enhances the durability and performance of the display device by integrating real-time voltage monitoring and protective measures.
5. The display device of claim 4 , wherein the driver comprises: an analog-digital converter configured to convert the sensing voltage into a sensing value in a digital form; a comparator configured to compare the sensing value with a reference value; and a control signal generator configured to generate the control signal based on a comparison result of the comparator.
A display device includes a driver circuit designed to process sensing signals from a touch-sensitive display panel. The driver circuit converts an analog sensing voltage from the panel into a digital sensing value using an analog-to-digital converter. This digital value is then compared to a predefined reference value by a comparator. Based on the comparison result, a control signal generator produces a control signal that adjusts the display's operation, such as touch detection or display calibration. The driver circuit ensures accurate and responsive touch input processing by digitizing and evaluating the sensing voltage against a reference, enabling precise control of the display's touch-sensitive functions. This design improves touch accuracy and reliability in display devices by dynamically adjusting system parameters based on real-time sensing data.
6. The display device of claim 4 , wherein the driver comprises: a reference voltage generator configured to generate a reference voltage; a comparator configured to compare the sensing voltage with the reference voltage; and a control signal generator configured to generate the control signal based on a comparison result of the comparator.
A display device includes a driver circuit for controlling display elements, such as pixels, to ensure proper operation and image quality. The driver circuit addresses the problem of maintaining consistent display performance by accurately sensing and adjusting electrical characteristics of the display elements. The driver includes a reference voltage generator that produces a stable reference voltage for comparison purposes. A comparator compares a sensing voltage, which represents the electrical state of a display element, with the reference voltage. Based on this comparison, a control signal generator produces a control signal that adjusts the operation of the display element to compensate for variations or deviations from desired performance. This feedback mechanism ensures that the display elements operate within specified parameters, improving uniformity and reliability across the display. The driver circuit may be integrated into a larger display system, such as an organic light-emitting diode (OLED) or liquid crystal display (LCD), to enhance image quality and longevity. The use of a reference voltage and comparator allows for precise control, reducing errors and optimizing power efficiency. This technology is particularly useful in high-resolution and high-brightness displays where precise electrical control is critical.
7. The display device of claim 2 , wherein the driving current generating circuit comprises: a first transistor comprising a first electrode electrically connected to the first power line through a second node, a second electrode electrically connected to the one electrode of the light emitting element through a first node, and a gate electrode electrically connected to a third node; a second transistor comprising a first electrode connected to the data line, a second electrode connected to the second node, and a gate electrode connected to a scan line; a third transistor comprising a first electrode connected to the first node, a second electrode connected to the third node, and a gate electrode connected to the scan line; and a storage capacitor between the first power line and the third node.
This invention relates to a display device, specifically an organic light-emitting diode (OLED) display with an improved driving current generating circuit. The problem addressed is the need for stable and efficient current control in OLED displays to ensure consistent brightness and longevity of the light-emitting elements. The display device includes a light-emitting element, such as an OLED, and a driving current generating circuit that supplies current to the light-emitting element. The circuit comprises a first transistor with a first electrode connected to a first power line through a second node, a second electrode connected to one electrode of the light-emitting element through a first node, and a gate electrode connected to a third node. A second transistor has a first electrode connected to a data line, a second electrode connected to the second node, and a gate electrode connected to a scan line. A third transistor has a first electrode connected to the first node, a second electrode connected to the third node, and a gate electrode connected to the scan line. A storage capacitor is positioned between the first power line and the third node. During operation, the second and third transistors are controlled by the scan line to selectively connect the data line to the second node and the first node to the third node, respectively. The storage capacitor stores a voltage corresponding to the data signal, which determines the driving current supplied to the light-emitting element through the first transistor. This configuration ensures precise current control, reducing variations in brightness and improving display uniformity. The circuit design also minimizes power consumption and extends the lifespan of the light-emitting elements.
8. The display device of claim 2 , wherein the driving current generating circuit comprises: a first transistor comprising a first electrode electrically connected to the first power line, a second electrode electrically connected to the one electrode of the light emitting element, and a gate electrode connected to a gate node; a second transistor comprising a first electrode connected to the data line, a second electrode connected to the gate node, and a gate electrode connected to a scan line; and a storage capacitor between the gate node and the one electrode of the light emitting element.
This invention relates to display devices, specifically organic light-emitting diode (OLED) displays, addressing the challenge of providing stable and uniform current to each pixel to ensure consistent brightness and longevity of the light-emitting elements. The display device includes a driving current generating circuit designed to supply precise current to OLED elements, preventing degradation over time. The circuit comprises a first transistor with its first electrode connected to a power line, its second electrode connected to one electrode of the light-emitting element, and its gate electrode linked to a gate node. A second transistor has its first electrode connected to a data line, its second electrode connected to the gate node, and its gate electrode connected to a scan line. A storage capacitor is positioned between the gate node and the one electrode of the light-emitting element. This configuration ensures that the driving current remains stable by storing the voltage applied during the data writing phase, allowing the first transistor to maintain a consistent current flow to the light-emitting element. The storage capacitor compensates for variations in the threshold voltage of the first transistor, improving display uniformity and reliability. The scan line controls the second transistor to write data voltages to the gate node, while the power line supplies the necessary operating voltage. This design enhances the performance of OLED displays by mitigating current fluctuations caused by transistor variations and aging effects.
9. The display device of claim 2 , further comprising a current limiting circuit connected between the third power line of the display panel and the driver, wherein the driver is configured to generate a control signal to allow the current limiting circuit to limit an amount of current flowing through the third power line, when the sensing voltage is out of the reference range.
This invention relates to display devices, specifically addressing issues related to power supply stability and current regulation in display panels. The technology aims to prevent damage or malfunction caused by excessive current flow in the power lines of a display panel, particularly when the sensed voltage deviates from a predefined reference range. The display device includes a display panel with multiple power lines, a driver circuit, and a current limiting circuit. The driver circuit monitors a sensing voltage from the display panel and compares it to a reference range. If the sensing voltage falls outside this range, the driver generates a control signal to activate the current limiting circuit. This circuit is connected between a specific power line (the third power line) of the display panel and the driver, regulating the current flow to prevent overcurrent conditions. The current limiting circuit ensures that the power line operates within safe limits, protecting the display panel and associated components from potential damage due to voltage fluctuations or faults. This solution enhances the reliability and longevity of display devices by dynamically adjusting current flow in response to voltage deviations, thereby maintaining stable operation under varying conditions. The current limiting circuit provides an additional layer of protection, complementing the driver's voltage monitoring and control functions.
10. The display device of claim 1 , wherein the driver is configured to vary the third power voltage when the sensing voltage is out of the reference range.
A display device includes a driver circuit that adjusts a power voltage based on a sensed voltage to maintain display performance. The device monitors a sensing voltage, which indicates the operational state of the display, and compares it to a predefined reference range. If the sensing voltage falls outside this range, the driver dynamically adjusts a third power voltage to compensate. This adjustment ensures stable display operation by correcting deviations in voltage levels that could otherwise degrade image quality or cause malfunctions. The driver may also include additional control logic to regulate other power voltages, such as a first and second power voltage, to optimize power efficiency and performance. The sensing voltage may be derived from various display components, including pixels, drivers, or power lines, to provide real-time feedback for precise voltage adjustments. This adaptive voltage control helps mitigate issues like flicker, uneven brightness, or power inefficiencies, particularly in high-resolution or high-dynamic-range displays. The system may further incorporate calibration routines to periodically update the reference range or adjustment parameters, ensuring long-term reliability. The invention is particularly useful in advanced display technologies where precise voltage regulation is critical for maintaining visual fidelity and energy efficiency.
11. The display device of claim 1 , wherein a voltage level of the first power voltage is greater than that of the second power voltage.
A display device includes a display panel with a plurality of pixels, each pixel having a light-emitting element and a driving transistor. The device also includes a first power voltage line and a second power voltage line connected to the pixels. The first power voltage line supplies a first power voltage to the driving transistors, while the second power voltage line supplies a second power voltage to the light-emitting elements. The first power voltage has a higher voltage level than the second power voltage. This configuration ensures that the driving transistors operate in a saturation region, providing stable current control for the light-emitting elements. The display device may also include a data driver for supplying data signals to the pixels and a scan driver for controlling the timing of pixel operations. The light-emitting elements may be organic light-emitting diodes (OLEDs), and the driving transistors may be thin-film transistors (TFTs). The voltage difference between the first and second power voltages ensures efficient and uniform light emission across the display panel.
12. A display device comprising: a display panel comprising a pixel electrically connected to each of a data line, a first power line, a second power line, and a third power line; a power supply configured to provide a first power voltage to the first power line, and a second power voltage to the second power line; and a driver configured to provide a data voltage to the data line, and a third power voltage to the third power line, wherein the driver is configured to determine whether a sensing voltage measured at the second power line is out of a reference range, and to vary the data voltage from a first voltage range to be within a second voltage range different from the first voltage range.
This invention relates to display devices, specifically addressing voltage regulation and sensing in organic light-emitting diode (OLED) displays. The problem solved involves maintaining display performance and longevity by dynamically adjusting data voltages in response to detected power line voltage deviations. The display device includes a display panel with pixels connected to multiple power lines (first, second, and third) and a data line. A power supply provides first and second power voltages to the first and second power lines, while a driver supplies data voltages to the data line and a third power voltage to the third power line. The driver monitors the second power line's sensing voltage to detect deviations from a predefined reference range. If the sensing voltage falls outside this range, the driver adjusts the data voltage from a first voltage range to a second, distinct voltage range to compensate for the deviation. This adaptive voltage control helps stabilize display operation, particularly in OLED displays where voltage fluctuations can degrade performance or lifespan. The system ensures consistent brightness and color accuracy by dynamically responding to power line variations without requiring external calibration.
13. The display device of claim 12 , wherein the second voltage range is a subset of the first voltage range, and wherein the second voltage range corresponds to a low luminance that is lower than an average luminance of the first voltage range.
A display device includes a pixel circuit configured to drive a light-emitting element, such as an organic light-emitting diode (OLED), using a voltage signal. The pixel circuit operates within a first voltage range to control the luminance of the light-emitting element. The device further includes a voltage adjustment circuit that adjusts the voltage signal to a second voltage range, which is a subset of the first voltage range. This second voltage range corresponds to a low luminance level that is lower than the average luminance achievable within the first voltage range. The voltage adjustment circuit ensures that the light-emitting element operates efficiently at low luminance levels, reducing power consumption and improving display performance. The pixel circuit may include a driving transistor and a switching transistor to control the voltage applied to the light-emitting element, while the voltage adjustment circuit modifies the voltage signal to maintain precise luminance control in the low-luminance subset. This configuration enhances the display's ability to produce fine-grained brightness variations at low luminance levels, which is particularly useful for high dynamic range (HDR) and low-power applications.
14. The display device of claim 13 , wherein the driver is configured to change the data voltage to correspond to a minimum grayscale when the sensing voltage is out of the reference range.
A display device includes a display panel with a plurality of pixels, each pixel having a light-emitting element and a driving transistor. The device also includes a driver configured to apply a data voltage to the driving transistor to control the light-emitting element. The driver is further configured to sense a sensing voltage from the driving transistor and compare the sensing voltage to a reference range. If the sensing voltage falls outside the reference range, the driver adjusts the data voltage to correspond to a minimum grayscale value. This adjustment ensures that the display panel operates within safe voltage limits, preventing damage to the driving transistor and maintaining display quality. The sensing voltage may be derived from a voltage across the driving transistor or another component in the pixel circuit. The reference range defines acceptable voltage levels for proper operation, and the minimum grayscale adjustment ensures the display remains functional even when voltage deviations occur. This feature is particularly useful in organic light-emitting diode (OLED) displays, where voltage variations can degrade performance over time. The driver may also include compensation circuitry to further stabilize the display output.
15. The display device of claim 13 , wherein the display panel comprises a plurality of pixels comprising first pixels configured to emit light of a first color, and second pixels configured to emit light of a second color, and wherein the driver is configured to change a data voltage of the first pixels to correspond to a minimum grayscale, and a data voltage of the second pixels to correspond to an intermediate grayscale greater than the minimum grayscale.
This invention relates to display devices, specifically addressing the issue of color shift and power consumption in displays with pixels of different colors. The display device includes a display panel with multiple pixels, where some pixels emit light of a first color (e.g., blue) and others emit light of a second color (e.g., red or green). The device also includes a driver circuit that controls the voltage applied to these pixels. To mitigate color shift and reduce power consumption, the driver adjusts the data voltage of the first-color pixels to correspond to a minimum grayscale level, while setting the data voltage of the second-color pixels to an intermediate grayscale level higher than the minimum. This approach ensures consistent color reproduction and efficiency by dynamically adjusting pixel voltages based on their emission characteristics. The display panel may also include a third set of pixels emitting a third color, with the driver similarly controlling their voltages to maintain color balance. The invention is particularly useful in high-resolution displays where precise color control is critical, such as in OLED or LCD panels. The driver may also compensate for variations in pixel performance over time, further enhancing display quality.
16. The display device of claim 12 , wherein the driver comprises: a control circuit configured to determine whether the sensing voltage is out of the reference range; a gamma voltage generating circuit configured to generate gamma voltages, and to vary a voltage range of the gamma voltages based on a determination result of the control circuit; and an analog-digital converter configured to generate the data voltage based on the gamma voltages and a grayscale value included in image data and corresponding to the pixel.
This invention relates to display devices, specifically addressing the problem of maintaining display quality under varying environmental or operational conditions. The device includes a driver circuit that dynamically adjusts display parameters to compensate for deviations in performance. The driver comprises a control circuit that monitors a sensing voltage to determine if it falls outside a predefined reference range, indicating potential display anomalies. If the sensing voltage is out of range, a gamma voltage generating circuit adjusts the voltage range of the gamma voltages used to drive the display. This adjustment ensures consistent grayscale representation despite variations in operating conditions. An analog-digital converter then generates the data voltage for each pixel by combining the adjusted gamma voltages with grayscale values from the input image data. This closed-loop feedback mechanism allows the display to self-correct and maintain accurate color and brightness levels, improving reliability and user experience. The system is particularly useful in environments where temperature, humidity, or other factors could otherwise degrade display performance.
17. The display device of claim 12 , further comprising a memory configured to store notification data, wherein the driver is configured to generate the data voltage based on the notification data when the sensing voltage is out of the reference range, and wherein the notification data corresponds to an error image representing that the second power voltage is not normally provided to the second power line.
This invention relates to display devices, specifically addressing issues where power supply abnormalities can disrupt normal display operation. The device includes a display panel with a plurality of pixels, each connected to a first power line and a second power line. A driver circuit generates data voltages to control pixel operation, while a sensing circuit monitors a sensing voltage on the first power line to detect power supply anomalies. If the sensing voltage falls outside a predefined reference range, indicating an abnormal power condition, the driver circuit generates a data voltage based on stored notification data. This notification data corresponds to an error image, visually indicating that the second power voltage is not being properly supplied to the second power line. The error image serves as a diagnostic tool, alerting users or systems to the power supply issue. The memory storing the notification data ensures the error image can be displayed even when normal power conditions are disrupted. This solution enhances reliability by providing immediate visual feedback when power abnormalities occur, allowing for quicker troubleshooting and maintenance.
18. The display device of claim 17 , wherein the error image comprises a black image, a single color image, a pattern image, or a pattern.
A display device includes a display panel with a plurality of pixels and a controller configured to detect a display error in at least one of the pixels. Upon detecting the error, the controller generates an error image to replace the erroneous pixel. The error image can be a black image, a single color image, a pattern image, or a pattern. The controller applies the error image to the erroneous pixel to mask the display error, ensuring the display remains functional and visually consistent. The error detection and correction process is automated, allowing the display to self-correct without manual intervention. This solution addresses display errors caused by defective pixels, ensuring a seamless viewing experience by dynamically replacing faulty pixels with a visually unobtrusive error image. The error image options provide flexibility in matching the display's content or design requirements, enhancing user experience and device reliability. The system is particularly useful in high-resolution displays where pixel defects are more noticeable.
19. A display device comprising: a display panel comprising a pixel electrically connected to each of a data line, a first power line, a second power line, and a third power line; a power supply configured to provide a first power voltage to the first power line, and a second power voltage to the second power line; and a driver configured to provide a data voltage to the data line, and a third power voltage to the third power line, wherein the driver is configured to determine whether a sensing voltage measured at the second power line is out of a reference range, and to generate a control signal when the sensing voltage is out of the reference range, and wherein the power supply is configured to interrupt the supply of the first power voltage in response to the control signal.
This invention relates to a display device with enhanced power management and fault detection. The device includes a display panel with pixels, each connected to a data line, a first power line, a second power line, and a third power line. A power supply provides a first power voltage to the first power line and a second power voltage to the second power line. A driver supplies a data voltage to the data line and a third power voltage to the third power line. The driver monitors the second power line for a sensing voltage and compares it to a reference range. If the sensing voltage falls outside this range, the driver generates a control signal. The power supply responds by interrupting the first power voltage supply, preventing potential damage or malfunction. This system ensures stable operation by detecting and mitigating power-related anomalies, such as voltage fluctuations or short circuits, before they affect the display. The third power line allows independent control of pixel operations, while the sensing mechanism provides real-time monitoring for proactive fault handling. This approach improves reliability and safety in display devices by integrating dynamic voltage regulation and fault detection.
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August 31, 2020
March 22, 2022
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